Ideal for those with impaired vision and hearing. Extra loud ringer up to five times louder than a normal telephone. Preferred range (superb quality) hearing aid compatible. Also comes with a water resistant wireless pendant alarm. Pressing the alarm button triggers dialling up to three self-programmed telephone numbers. Easy to use big buttons. In the event of mains power failure, calls can still be made. Back lit keypad. Handsfree speakerphone. Premium hearing aid compatible.